Engine control mechanism



May ,5, 1959 A. H. WlNKLER 2,885,194

ENGINE CONTROL MECHANISM Filed Oct. 24, 1956 2 S 1'xee(.sShee't, 1

2a 30 v GD INVENTOR,

fle

ATTORNEY.

May 5, 1959 A. H. WINKLER ENGINE CONTROL MECHANISM 2 Sheets-Sheet 2 Filed Oct. 24, 1956 INVENTON.

ATTG/QNEY.

United States Patent D ice j Patented May5, 1959-.

tle valve 16 mounted therein on shafts 20 and 22 respectively. A starting switch 24 is mounted on the body 2,885,194 portion 26 of the carburetor for actuation in a manner ENGINE CONTROL MECHANISM Application October 24, 1956, Serial No. 618,097

4 Claims. (Cl. 261-52) This invention pertains to carburetors and more particularly to carburetors having a starting control switch operably associated with the throttle such as, for example, is disclosed in U.S. Patent No. 2,492,340 issued December 27, 1949, or U.S,. Patent No. ,2,340,736 issued February 1, 1944.

The starting operation with such arrangements consists in closing the ignition switch and depressing the accelerator pedal. The latter operationcloses the starting control switch which indirectly completes the starting motor circuit, as fully explained in the above menne r t 1: j.

In the majority of automotive carburetors, a connection is provided between the throttle and the choke valve whereby opening the throttle to the wide open position causes the choke valve to move to at least partially open position. Such an arrangement is provided to overcome a flooded condition of the engine should one occur during a starting period when the choke valve is yieldingly held in a closed position by the thermostat. Fully depressing a throttle partially opens the choke valve and permits an inflow of additional air to eliminate the flooded condition.

Where both such devices are used in the same installation it is necessary, in order to start the engine when cold, to depress the accelerator pedal sufficiently to close the starting switch but not to such a point as will force the choke valve to a partially open position. In U.S. Patents 2,340,736 and 2,393,440 there are shown means for sensibly indicating to the operator that the accelerating pedal has been depressed to the proper degree to facilitate starting. This sensible indication also notifies the operator that further depression of the accelerating pedal will cause the choke valve to be opened.

It is an object of the present invention to provide a relatively inexpensive and simple means for providing the operator with a sensible indication that the accelerator pedal has been sufiiciently depressed to actuate the starting switch.

Other objects and advantages will be apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

Figure 1 is a top view of a carburetor embodying the invention;

Figure 2 is an end view of the carburetor shown in Figure 1;

Figure 3 is a fragmentary view of the carburetor showing the position of elements therein when the throttle and choke valve are closed;

Figure 4 shows the position of elements when the choke valve is closed and the throttle valve has been opened sufficiently to close the starting switch; and

Figure 5 shows the position of elements when the throttle valve is in wide open position and the choke valve moved to partially open position.

Referring now to the drawings and more particularly to Figure 1, there is shown a carburetor having an induction passage 12 with a choke valve 14 and a throtmore fully described in U.S. Patent 2,174,313.

An automatic choke mechanism 28 of a type described and claimed in my copending application Serial No.

504,937 filed April 29, 1955, now Patent No. 2,833,529. dated May 6, 1958, is also mounted on body 26 adjacent the starting switch.

A throttle lever 30 is mounted on shaft 22 and is provided with a turned over lug 32 which is formed for engagement with an adjustable abutment 34 located on body 26. A resilient member or torsion spring 36 is looped about shaft 22 and is formed at one end with a cantilevered portion 38 which is restrained by a turned over lug 40 formed on lever 30. The other end 42 of spring 36 is restrained by lug 32. A lever 44 is mounted.

on a stub shaft 46 on body 26. Lever 44 is connected for rotation with the choke through a lost motion con-J nection including rod 48 to an arm or lever 50 which is.

secured to choke shaft 20. Lever 44 is weighted to' assume the position shown in Fig. 2 when the choke valve is open. Clockwise rotation of lever 44 is limited by a stop member 52 formed on body 26 which projects into.

the path of a turned over lug 54 formed on said lever.

. Throttle lever 30 is adapted for connection with a con-.

ventional accelerator pedal (not shown) for actuation thereby.

In operation, the parts assume the position shown in Figure 3 when the choke and throttle valves are in closed position. Upon movement of the accelerating pedal suflicient to actuate the starting switch 24, the parts assume the position shown in Figure 4. As shown therein, spring 36 is moved into engagement with lug 54 of lever 44 on a line of action passing substantially through shaft 46. In the engaged position spring 36 adds an additional force to the force required to open the throttle and thereby provides a sensible indication to the operator that the accelerating pedal has been depressed sutficiently to actuate the starting switch. The point of engagement of spring 36 with lug 54 may be adjusted by bending the end of the cantilevered portion 38 of the spring or by bending the lug itself.

Upon further opening of the throttle valve, a lug 56 formed on throttle lever 30 moves into engagement with lever 44 rotating the latter clockwise sufiiciently to move the choke valve 14 to partially open position. The position of parts after lug 56 has been moved into engagement with lever 44 is shown in Figure 5. As shown therein, lug 54 has been moved from the path of the end portion 38 of spring 36. In this position spring 36 no longer resists the opening of the throttle.

In the control mechanism of my invention the lever 44 is positively positioned in the path of spring 36 when the choke valve is in closed position. The operation of my control is certain and reliable and substantially unaffected by dirt and other impurities. Adjustment of the control of the control may be quickly and simply accomplished. Furthermore, this improved operation and adjustment is accomplished with a simple, inexpensive direct acting resilient member which eliminates levers and more complex construction of the prior art devices.

Although a particular embodiment of my invention has been described, it will be understood by those skilled in the art that the objects of the invention may be obtained by the use of constructions different in certain respects from the disclosed without departing from the underlying principles of the invention.

I claim:

1. In a carburetor for an internal combustion engine having an induction passage with a throttle valve and a shaft, a choke lever m ddshaitforrotationwith said choke valve, a shaft for saidthrottle valve, a throttle lever mounted on said shaft, means formed on said throttle lever for t choke lever at a predetermined We! a resilient memberrotatable with said valve to directly engage said choke lever on a linp oflaction passing through said first men M, Mi said member being constructed and arhaving an induction passage with a throttle valve twinks mounted therein, a shaft, a choke lever on aid ahatt for; rotation with said choke, a throttle valves pair of spacedlugs ophelm wanted to said throttle shaft, and a torsion on said throttle shaft and stressed beat n predetermined throttle opening,

lam carburetor for an internal combustion engine induction passage with a throttle valve and a cltob vllvemounted therein, a choke lever rotatably munted ontsaid carburetor, an operative connectionbe- 25 UNITED STATES: PATENTS- m flilliehoke lever and said choke valve,a shaft for 2.302.521 Nov; 17.1942

lid throttle valve a throttle lever operatively connected 2.307.486 Carlson Jan. 5, I943 tnl? saidi throttle shaft and formed for engagement with 2,339,867 Mann Jan. 25; 19441 said? choke lever when said throttle is opened a prede- 2,393,440 Wirth Jan; 2, 1946 amount, aresilient member operatively con- 30 2,665,891 Smitley Jan. 12,195

it l l d w u l am.

to engage said choke lever on action passingthrough said first; mentioned nected to and'rota't'able with" said throttle lever formed at one and to engage lever on a'line ofmetion passing through the axis of rotation of said choke lever when said throttle is opened less than said predeterrnined amount and said choke valve is in substantially closed position.

4. In a carburetor fol: combustion engine having an induction passage with a throttle valve and a choke valve mounted therein, ashaft, a choke lever o atably mouutedson. shaft. opera ivcly cow amines/aid. choke. lever aaidichoket-a mam said throttle valve,:a throttle lever mounted 0mm: throttle shaft, means formed on said throttle lever for engagement with said choke lever to said chokevalve when said throttle is mpmdetermined amount, a torsion spring having a free end and being mounted on said throttle shaft for rotation by said throttle lever whereby the, free end of said spring engages said choke lever on a line of action" passingthrough said first men; tioned shaft at a throttle opening lcssthansaid c mined.

Cltedintbefileiofthisj atent? 

